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Just after 10.30am, officers noticed Monk was increasingly preoccupied with the effects of the pepper spray, and stormed the library, rescuing the uninjured librarian and taking Monk back into custody.

"Our team acted with great professionalism to bring about the best possible outcome, ensuring that our employee was unharmed," ADC director Charles Ryan said.

Officers stormed the library and rescued the employee without injury. (Supplied)

Monk will face new charges over the incident. He is currently serving 97 years in prison.

He was initially jailed in 1988 for armed robbery, sexual assault and kidnapping.

In 2006, he was convicted for offences committed while behind bars, including aggravated assault, kidnapping, promoting prison contraband and sexual assault.